Mixing water with diesel fuel may decrease air pollution, but the right surfactant is key

As noted in prior posts, diesel engines have had a well established reputation for producing particulates, oxides of nitrogen (an important ingredient in smog), and odor. With the recent requirement for the use of low-sulfur fuel in improved diesel engines for cars and trucks, the emissions have decreased...

In a smallish room, body heat draws particles near, enhancing inhalation

Most models involving inhalation of particulates of various sorts (e.g., microbes, pollen, dust, toxins) assume a somewhat even distribution of the particulates in the air that is inhaled. While such an assumption helps to simplify exposure calculations, it is factually inaccurate in some circumstances...

The trend toward use of heavier crudes increases the carbon footprint of petroleum products

Heavier crudes are, by definition, more viscous. The also contain greater amounts of sulfur, which must be removed because of the adverse impact of sulfur on various catalysts used in the refining process. The sulfur content of fuel is also controlled because of its impact on particulate generation....

NRDC challenge to EPA approval of California CAA SIP fails

California submitted a Clean Air Act State Implementation Plan to the EPA for approval. Pursuant to the "conformity rule" under 40 C.F.R. Section 93.118, the EPA conducted a review to determine whether the SIP's motor vehicle emissions budgets were adequate for transportation conformity...

Can addressing air pollution decrease global warming? You betcha

Prior posts have noted the adverse health impacts from small particles, often referred to generally as PM10 and/or PM2.5. Prior posts have also noted the adverse impact of soot on global warming, which because it is black and absorbs heat warms up the atmosphere and whatever it is coating (e.g., glaciers...